Nanowires of conjugated polymer prepared by tuning the interaction between the solvent and polymer
Nanowires of conjugated polymer prepared by tuning the interaction between the solvent and polymer
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DOI：
10.1016/j.polymer.2018.06.068
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发表时间：
2018-08
期刊：
影响因子：
4.6
通讯作者：
Liang Chen;Kefeng Zhao;Xinxiu Cao;Jiangang Liu;Xinhong Yu;Yanchun Han
中科院分区：
文献类型：
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作者：
Liang Chen;Kefeng Zhao;Xinxiu Cao;Jiangang Liu;Xinhong Yu;Yanchun Han
高密度的共轭聚合物纳米线具有良好的电荷传输性能。然而，在较高的溶液浓度下，共轭聚合物链缠结严重，不利于成核生长纳米线。在本文中，我们通过调节溶剂和共轭聚合物之间的相互作用半径（Ra）来控制纠缠参与解纠缠参与成核和生长的平衡。在临界Ra下，解缠结的聚合物链可以成核形成纳米线，因为其含量是适度过饱和的。因此，缠结参与解缠结的平衡被打破，并且缠结的聚合物链被进一步连续解缠结以提供用于纳米线形成的链的更容易的扩散性。因此，聚[2，5-双（3-十四烷基噻吩-2-基）噻吩并-[3，2-B]噻吩]（PBTTT-C14）在二硫化碳（CS2）：环己基苯（Ch B）= 3：7（Ra = 2.56）的混合溶剂中以lmg/ml的较高浓度通过老化形成致密纳米线。纳米线的密度随着浓度的增加和老化时间的延长而增加。纳米线的长度大于10 μm，宽度约为20 nm。透射电子显微镜观察表明，纳米线的电子密度高，结晶度高。
The nanowire of conjugated polymer with higher density is desirable for its improved charge transport. However, at a higher solution concentration, the conjugated polymer chain entanglement is severe and not beneficial for the nucleation to grow nanowires. In this paper, we control the equilibrium of entanglement ↔ disentanglement ↔ nucleation and growth by tuning the radius of interaction (Ra) between the solvent and conjugated polymer. At the critical Ra, the disentangled polymer chain could nucleate to form nanowires because its content is moderately supersaturated. Thus, the equilibrium of entanglement ↔ disentanglement is broken and the entangled polymer chain is further continuously disentangled to provide easier diffusivity of chains for nanowire formation. Accordingly, the dense nanowires of poly[2,5-bis(3-tetradecylthiophen-2-yl)thieno-[3,2-b]thiophene] (PBTTT-C14) were formed in the mixed solvent carbon disulfide (CS2): cyclohexylbenzene (ChB) = 3:7 (Ra = 2.56) at a higher concentration of 1 mg/ml by aging. The density of the nanowire increased with increasing concentration and aging time. The nanowires were more than 10 μm in length and about 20 nm in width. The contrast was obvious in transmission electron microscopy which indicated the high electronic density and the high crystallinity of the nanowires.